Shears



P 1929- w. v. ROBERTSON 1,710,950

SHEARS Filed Dec. 2a, 1927 Invento r, v William Victor Robertson,

' Attorney.

. Patented Apr. 30, 1929.

umen WILLIAM VICTOR ROBERTSON, OF WEEHAWKEN, NEW JERSEY.

,. SHEARS.

Application filed December 28, 1927. Serial No. 243,0 01

In the cutting of material, when the length of cutis greater than can be made at a single closure, or when the cut follows a curved line, and it is necessary to nsc :1 number of opera- 5 tions of the shears in marking the cut, it is desirable that the shear should not full close in order to more conveniently feed the material to the shears, but there urc occasions, when the cut is to he made up to a. head in the lnutcriul, Whcn the shcnr dd iully close so as to cut up to its po Ihis arises pznticulnrly in the trinnninu of the lins from molded rubber goods such for example as the repair patches for footwear set forth in United States patent to Joules Robertson,

J12, Reissue No. 15,201.

The object of this illYtnt'lOil is to provide a poWcr-operuted pair of shears which is adapted to such work, and a further object is to provide :1 pair of shears in which the power is sufiiciently limited so that thcycannot seriously injure the fingers of an operative.

In the accompanying sheet of drawings Which forms a, part of this description,

Figure 1 is s top View of a pair ofshcars which embodies this invention.

Fig. 2 is an elevation of the same. A stand 10 has mounted thereon o fixed shear ll nnd in cooperation with th fixed shear u llli'Wfil'Dll? shew 12. conveniently of the pivoted type and pivoted at 13. The mounting is such that the points of the shears are exposed. A. shaft 1% driven from a pulley 15, carries an eccentric 16 which bears the stop out of the Way to permit the spring 5 to i'ully close the shears, the low point of the eccentric allowing of such full closure. A spring 22 returns the stop to its position for restricting the shears to partial closure.

A convenient size for the shears is double so i the scale of the original patent drawings or three times the scale of thecustomary patent T reduction for the printed copies.

I claim: r

1. The comhinntion. of a pair of shears, :15.

means for their power operation means :lor changing theoperation of the shears from partial to full closure, n button for operating the changingmeans for full closure, and automatic means for restoring the changing means to partial closure position.

2. The combination of a pair of shears, power operated means for openingthe shears, a spring for closing the shears, -a movable stop for restricting the shears to partial 010- sure, manual means for operating the stop to permit full closure of the shears. and a spring for returning the stop to its position for restricting the shears to partialclosure.

WILLIAM VICTOR ROBERTSON. 

